Muffled furnace



(No Model.) 2 sheets-sheet 2.

F. J. FALDING.-

MUFFLED FURNACE.

No. 539,729. Patented May 21,18 95.

ATTEET. INvEN-r 13F;

BY 5 $4M ATT EIFNFLY.

UNITED I STATES PATENT EETCE.

FREDERIO JOHN FALDING, OF CLEVELAND, OHIO.

MUFFLED FURNACE.

SPECIFICATION forming part of Letters Patent No. 539,729, dated May 21,1895.

Application filed August '7, 18 94.

a full, clear, and exact description of the invention, which will enableothers skilled in the art to which itappertains to make and use thesame.

My invention relates to muffled furnaces,

and the invention consists in the construction of a muffle, the methodof conducting the furnacegases around the muffie and to economize andutilize the heat radiated from the muffle to heat the furnace, byheating the air which goes to the furnace to supp'ortcombns tion,thereby saving the heat which Would otherwise escape or be carried awayby radiation, all substantially as shown and described and particularlypointed out in the claims.

In the accompanying drawings, forming a part of the specification,Figure 1 is a longitudinal sectional elevation of a furnace constructedwith my improvements and taken on a line corresponding to 1 1, Fig. 3.Fig. 2

is a cross-section on a line corresponding to lines a: at, Fig. 1, and 22, Fig. 3. Fig. 3 is a horizontal section on a line corresponding toline 3 3, Figs. 1 and 2.

In the drawings an application of the muffie in a sulphate of sodafurnace is shown, and A represents the furnace proper, B the muffie, andO the usual pot at the side of the mnffie.

I lay no claim to novelty in the construction or arrangement of the potin respect to the muffle, nor in the muffie itself in connection with orin its relation to the pot,bnt I do claim the muffie when modified andconstructed as shown and described herein.

In all cases, so far as I am aware, muffied furnaces heretofore havebeen of an ordinary plain construction in so far as the top, bottom andsides were concerned, and there was no provision in them whereby theheat which was radiated therefrom was utilized for any purposewhatsoever. It followed therefore that there was an excessive andwasteful loss of heat because muffies necessarily require a Very hightemperature to do their work. I

serial No. 519,670. (No model.)

have therefore improved the construction of the muffie so that theradiated heat at both its top and bottom is economized and saved andused over again through the furnace for heating the mnffie, as hereindescribed. In this improved construction I employ a series of fines ortiles 2 arranged side by side over the muffie the full width and lengththereof and opening at one end into the top of the furnace and at theother end into the rear wall 0, thereby forming the body of the muffle.Along the bottom of the muffie and forming the bottom thereof is anotherseries of fines or tiles -3-, or their equivalent, running also the fulllength of the muffie and at their inner ends and near the furnacedischarging into an open down passage or chamber in the back Wall of thefurnace A and thence to the flue opening 5-- which leads to the chimneyor smoke stack.

I The rear wall 0' of the muffie is formed with an internal passage 6which connects the two sets of fines -2 and 3, and so it occurs that theheat and products of combustion enter the fines 2 from the top of thefurnace A and, passing thence over the top of the muffie B, enter therear vertical passage or channel -6, from which they take the returnfiues3- along the bottom of "the muffie and pass thence into thedischarge passage and fines -4t-- and 5 at the immediate rear of thefurnace A.

Now, to preserve and utilize the heat, which obviously would be radiatedfrom these top and bottom fines, I have constructed the walls of thefurnace and muffie to adapt them .to receive top and bottom air fines 8and 9. The topair fines 8 are built into the'rear wall D of the furnaceA and commnnicate with an inlet passage -10 at the top thereof. Thebottom air fines 9 are laid. along immediately beneath the bottom heatconveying fines 3- and dischargein'to the down passage having an outletnear the front of the furnace from the wall thereof beneath the firegrate. The rear-wall O of the muffie has a down passage 15 connectingthe top air fines 8 with the bottom air fines 9-. Both sets of air fines-8 and -9 cover the entire width of the muffle and 0f the top and bottomfines -2 and -3, respectively, so that any heat that is radiated fromsaid flues 2- and 3 unavoidably passes into the fiues -8- and 9 It thusoccurs that whatever radiation of heat takes place from the fiues. 2-and 3 up or down must enter the air conveying fines 8 and 9 and the airin said fines being heated is carried to the furnace in a heated state,adding just that much to the heat of the furnace and besides promotingbetter combustion altogether and getting more heat out of the samequantity of coal than could be obtained if cold airWere used instead.

That I claim is 1. A muffle furnace consisting of a series of paralleltile heating-fines laid side by side and forming the top and bottom ofthe muflie respectively, and air fines for the furnace extending overthe top and along immediately beneath the bottom of said heating fines,and the rear Wall of the muffle provided with a connecting passage foreach set of flues, substantially as set forth.

2. In a muffie furnace, a heat passage from the top of the furnace and aparallel return passage beneath the muffle, a rear wall hav- 25 ing apassage connecting said passages, a series of parallel tubes extendingfull length over the said heat passage and along beneath I the returnpassage and a connecting passage at their rear, substantially as setforth.

3. The furnacehaving the outgoing heat passage formed by aseries ofparallel earthen tubes -2- and a corresponding series of return tubes 3beneath and the chamber between said sets of tubes and the rear wallhaving a common passage from one set of tubes to the other, incombination with the parallel air tubes 8 and 9 arranged over and underthe said heat passages respectively, and the said tubes having adischarge into the furnace, substantially as set forth.

Witness my hand to the foregoing specification this 5th day of July,189%.

,FREDERIG JOHN FALDING.

Witnesses:

H. A. FRANK, J. H. C. MOQUILKEN.

